Astrophysics: Early black holes uncovered

Astrophysics: Early black holes uncovered

Nature 474, 7351 (2011). doi:10.1038/474293a

Authors: Alexey Vikhlinin

Collective X-ray emission from distant galaxies reveals a hidden population of supermassive black holes. This finding suggests that galaxies and their central black holes have been coevolving since early cosmic times. See Letter p.356